Yarn drawing device



Aug W 1956 w, LENK YARN DRAWING DEVICE Filed Sept. 15, 1953 United States Patent YARN DRAWING DEVICE Walter Leak, Remscheid-Lermep, Germany, assignor to Barmer lllaschinenfabrik Aktiengesellschaft, Wuppertal-Uberbarmen, Germany, a joinbstockcompany Application September 15, 1953, Serial No. 380,248 Claims priority, application Germany September 15, 1952 12 Claims. (Cl. 28---71.3)

The present invention relates to a yarn drawing device, and more particularly to a yarn drawing device for multiple-ply yarns which are stretched before being wound on coils.

Drawing devices are known in which yarn is guided according to its later use over a smaller or greater number of driven rollers having different diameters, the diameters being suitably chosen to consecutively stretch the yarn to an increasing extent. Drawing rollers of this type require a separate drive provided with a variable transmission, and sometimes exchangeable gears, in order to obtain the desired stretching of the yarn.

It is the object of the present invention to overcome the disadvantages of the known drawing devices, and to provide a simple, but effective stretching device for yarn.

It is another object of the present invention to stretch yarn by drawing the yarn in a devious path over stationary stretching means which frictionally engage the yarn.

It is a further object of the present invention to provide two stretching members spaced from each other in such manner as to guide a drawn yarn along a zig-zag path at whose corners the yarn is frictionally engaged by the stretching members so that the yarn between the stretching members and the draw device is stretched.

It is a still further object of the present invention, to mount one of the seretching members movable relative to the other stretching member for varying the shape of the Zig-zag path of the yarn whereby the friction on the yarn may be adjusted to obtain the desired degree of stretching.

With these objects in view the present invention mainly consists in a drawing device for yarn, and comprises yarn supply means, such as a freely rotatable spool carrying a yarn coil; drawing means, such as driven rollers for drawing yarn from the spool; and stretching means located intermediate the spool and the drawing rollers. The stretching means preferably include two spaced stretching members consisting of a Wear-resistant material.

According to the present invention the yarn passes in a devious zig-zag path around the stretching members and is frictionally engaged and braked by the same so that the portion of the yarn between stretching members and the drawing rollers is stretched.

Preferably the position of one of the stretching members is adjustable so that the shape of the zigzag path may be varied.

In order to adapt the device according to the present invention to different yarns, pairs of corresponding yarn engaging grooves may be provided in the stretching members. A set of differently shaped grooves is preferably provided on each stretching member which are made adjustable in axial direction so that pairs of corresponding grooves can be placed in the path of the yarn.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be 2,757,433 Patented Aug. 7, 1956 best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

Fig. 1 is a front elevation of a preferred embodiment of the present invention;

Fig. 2 is a front elevation of a detail; and

Fig. 3 is a side view of the detail shown in Pig. 2.

Referring now to the drawing and more particularly to Fig. 1, on a fixed supporting bracket 1 a guiding member 2 is fixedly mounted which is formed with a guiding eye 3 through which the yarn passes which is supplied by the yarn supply means. The yarn supply means is a yarn spool 15 rotatably supported on a shaft 12. On the supporting bracket 1 a supporting means 5 is fixedly mounted which is provided with a slot 5' ending in a bore in which the first stretching member, the pin 6, is clamped by the screw 13, see Figs. 2 and 3. The supporting arm member 7 consists of two clamping portions which are formed with semi-circular recesses 7 and 7. The two clamping portions of the supporting arm 7 are clamped by means of the screw 14 to the stretching pin 6, while the second stretching member, the pin 8, is clamped in the recess 7. As best seen in Fig. 1, the supporting arm 7 can be pivoted from the illustrated position to a position shown in broken lines when the screw 13 is loosened. The yarn 4 passes from the yarn supply means 15, through the eye 3, and over the pins 6 and 8 in a devious zig-zag path to the drawing means, which in the illustrated embodiment are a pair of rollers It] and 11, which are driven by suitable means.

It is apparent that the stretching means 6, 7, 8 frictionally engage the yarn and brake the movement of the same so that the yarn portion between the stretching means and the drawing means 10, 11 is stretched. When the supporting arm is turned to the position illustrated in broken lines in Fig. 1, the are along which the yarn 4 engages the engaging surface portions of the stretching pins 6 and 3 is reduced so that the friction is reduced, and the yarn is tensioned and stretched to a lesser extent.

The stretching pins 6 and 8 are adjustable in axial direction when the screws 13 and 14 are loosened. The stretching pins are provided with annular grooves 9 which extend around the perimeter thereof and are of different width and diameter. Corresponding sets of grooves 9 are provided on the stretching pins 6 and 8, and by axial adjustment pairs of grooves 9 on both pins which correspond in width and diameter are moved into the transversal plane in which the yarn 4 extends. Thereby a suitable pair of grooves 9 can be used with yarns of different thickness, and the curvature of the are along which the yarn is frictionally engaged by the stretching pins suitably chosen in accordance with the properties of the yarn.

Since the yarn sliding on the surface of the stretching members 6 and 3 causes great frictional wear, the stretching members 6 and 7 are preferably made of a wearresistant material such as sintered argillaceous clay, and particularly of synthetic sapphire.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of drawing device differing from thhe types described above.

While the invention has been illustrated and described as embodied in a drawing device including a stretching means frictionally engaging the yarn and guiding the same along a zig-zag path, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. A drawing device for yarn, comprising, in combination, yarn supply means; drawing means for drawing yarn from said yarn supply means; and stretching means located intermediate said yarn supply means said drawing means and formed with two sets of peripheral grooves of different width, each groove of each set of grooves being associated with a groove of the other set of grooves, associated grooves being adapted to engage a yarn passing from said supply means to said drawing means for guiding the yarn along a devious path, associated grooves being adapted to frictionally engage the yarn and to produce a stretching tension in the yarn between said stretching means and said drawing means.

2. A drawing device for yarn, comprising, in combinm tion, yarn supply means; drawing means for drawing yarn from said yarn supply means; and stretching means located intermediate said yarn supply means and said drawing means and including at least two spaced yarn engaging surface portions formed with two sets of peripheral grooves of ditferent width, each groove of each set of grooves being associated with a groove of the other set of grooves, associated grooves being adapted to engage a yarn passing from said supply means to said drawing means for guiding the yarn along a zigzag path, associated grooves being adapted to frictionally engage the yarn and to produce a stretching tension in the yarn between said stretching means and said drawing means.

3. A drawing device for yarn, comprising, in combination, yarn supply means; drawing means for drawing yarn from said yarn supply means; and stretching means located intermediate said yarn supply means and said drawing means and including at least two spaced stretching members formed with two sets of peripheral grooves of different width, each groove of each set of grooves being associated with a groove of the other set of grooves,

associated grooves being adapted to engage a yarn passing from said supply means to said drawing means for guiding the yarn along a zig-Zag path, associated grooves being adapted to frictionally engage the yarn and to produce a stretching tension in the yarn between said stretching means and said drawing means.

4 A drawing device for yarn, comprising, in combination, yarn supply means; drawing means for drawing yarn from said yarn supply means; and stretching means located intermediate said yarn supply means and said drawing means and including at least two spaced stretching members, formed with two sets of peripheral grooves of different width, each groove of each set of grooves being associated with a groove of the other set of grooves, associated grooves being adapted to engage a yarn passing from said supply means to said drawing means for guiding the yarn along a zig-zag path, at least one of said stretching members being movable relative to the other of said stretching members for varying the shape of the zigzag path, associated grooves being adapted to frictionally engage the yarn and to produce a stretching tension in the yarn between said stretching means and said drawing means.

5. A drawing device for yarn, comprising, in combination, yarn supply means; drawing means for drawing a yarn from said yarn supply means; supporting means; a first stretching member mounted on said supporting means intermediate said yarn supply means and said drawing means; a supporting arm member pivotally mounted at one end thereof on said first stretching member, and turnable between a plurality of positions; a second stretching member mounted on the other end of said supporting arm and being movable with the same between a plurality of positions spaced from said first stretching member and located intermediate said supply means and said drawing means, each of said stretching members having at least one yarn engaging surface portion formed with a set of peripheral annular grooves of difierent diameter and width, each groove of each set being associated with one groove of the other set of grooves and adapted to engage a yarn passing from said supply means to said drawing means for guiding the yarn along a r path whose shape is determined by the position of said second stretching member, associated grooves being adapted to trictionally engage the yarn and to produce a stretching tension in the yarn between said stretching members and said drawing means, said stretching tension depending on the position of said second stretching member, said stretching members being adjustable in axial direction for bringing different pairs of associated grooves into the path of the yarn.

6. A drawing device for yarn, comprising, in combination, yarn supply means; drawing means for drawing a yarn from said yarn supply means; supporting means; a first stretching pin mounted on said supporting means intermediate said yarn supply means and said drawing means; a supporting arm member pivotally mounted at one end thereof on said first stretching pin, and turnable between a plurality of positions, said supporting arm member including two clamping portions formed with corresponding clamping recesses; means for pressing said clamping portions together; a second stretching pin mounted on the other end of said supporting arm and being movable with the same between a plurality of positions spaced from said first stretching pin and located intermediate said supply means and said drawing means,

each of said stretching pins being mounted in said clamping recesses between said clamping portions and having at least one yarn engaging surface portion adapted to engage a yarn passing from said supply means to said drawing means for guiding the yarn along a zig-zag path whose shape is determined by the position of said second stretching pin, said yarn engaging surface portions being adapted to frictionally engage the yarn and to produce a stretching tension in the yarn between said stretching pins and said drawing means, said stretching tension depending on the position of said second stretching pin.

7. A drawing device for yarn, comprising, in combination, yarn supply means; drawing means for drawing yarn from said yarn supply means; supporting means; two spaced stretching pins mounted on said supporting means adjustably movable in axial direction, each of said stretching pins having a set of annular peripheral grooves of different width, each groove of each set of grooves being associated with a groove of the other set of grooves, associated grooves on said two spaced stretching pins being adapted to engage a yarn passing from said supply means to said drawing means for guiding the yarn along a zigzag path, so as to produce a stretching tension in the yarn between said stretching means and said drawing means.

8. A drawing device for yarn, as claimed in claim 7 wherein the annular peripheral grooves of each set of grooves have diflerent diameters for guiding the yarn around arcs of different radius of curvature.

9. A drawing device as claimed in claim 8 wherein one of said stretching pins is mounted on said supporting means movable relative to the other stretching pin for varying the shape of said zig-zag path and the lengths of the arcs along which said pins engage the yarn.

10. A drawing device as claimed in claim 7 wherein said stretching pins consist of sintered argillaceous clay.

11. A drawing device as claimed in claim 7 wherein said two spaced stretching pins consist of synthetic sapphire.

12. A drawing device for yarn comprising, in combination, yarn supply means; drawing means for drawing yarn from said yarn supply means; supporting means; and

stretching means mounted on said supporting means intermediate said yarn supply means and said drawing means, said stretching means being formed with two sets of peripheral grooves of different Width, each groove of each set of grooves being associated with a groove of the other set of grooves, associated grooves being adapted to en gage a yarn passing from said supply means to said drawing means for guiding the yarn along a devious path, said stretching means being mounted on said supporting means adjustable in a direction transverse to the extension of said grooves for bringing different pairs of associated grooves of said two sets of grooves into the path of the yarn.

References Cited in the file of this patent UNITED STATES PATENTS 8%,555 Mitchell Mar. 18, 1905 1,459,332 Hineline June 19, 1923 1,856,188 Holmes May 3, 1932 2,148,162 Killette Feb. 21, 1939 2,306,660 Gift Dec. 29, 1942 

